[linux-rt-devel:linux-5.10.y-rt-rebase 76/252] kernel/printk/printk.c:1899:2: warning: function 'printk_sprint' might be a candidate for 'gnu_printf' format attribute

[linux-rt-devel:linux-5.10.y-rt-rebase 76/252] kernel/printk/printk.c:1899:2: warning: function 'printk_sprint' might be a candidate for 'gnu_printf' format attribute

[kernel test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-5.10.y-rt-rebase
head:   f0e8c5cc07c1ff61f3e3f0cdc67ebbaba3efba35
commit: 2f0edafd96943679520f78dce1407be69dd636c8 [76/252] printk: remove logbuf_lock, add syslog_lock
config: xtensa-allyesconfig (attached as .config)
compiler: xtensa-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git/commit/?id=2f0edafd96943679520f78dce1407be69dd636c8
        git remote add linux-rt-devel https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git
        git fetch --no-tags linux-rt-devel linux-5.10.y-rt-rebase
        git checkout 2f0edafd96943679520f78dce1407be69dd636c8
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=xtensa 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   kernel/printk/printk.c: In function 'printk_sprint':
>> kernel/printk/printk.c:1899:2: warning: function 'printk_sprint' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format]
    1899 |  text_len = vscnprintf(text, size, fmt, args);
         |  ^~~~~~~~

vim +1899 kernel/printk/printk.c

  1892	
  1893	static u16 printk_sprint(char *text, u16 size, int facility, enum log_flags *lflags,
  1894				 const char *fmt, va_list args)
  1895	{
  1896		char *orig_text = text;
  1897		u16 text_len;
  1898	
> 1899		text_len = vscnprintf(text, size, fmt, args);
  1900	
  1901		/* Mark and strip a trailing newline. */
  1902		if (text_len && text[text_len - 1] == '\n') {
  1903			text_len--;
  1904			*lflags |= LOG_NEWLINE;
  1905		}
  1906	
  1907		/* Strip kernel syslog prefix. */
  1908		if (facility == 0) {
  1909			while (text_len >= 2 && printk_get_level(text)) {
  1910				text_len -= 2;
  1911				text += 2;
  1912			}
  1913	
  1914			if (text != orig_text)
  1915				memmove(orig_text, text, text_len);
  1916		}
  1917	
  1918		return text_len;
  1919	}
  1920	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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